Rotating nozzle spray gun



May 13, 1952 w. M. WINDHOM, JR 2,596,191 1 ROTATING NOZZLE SPRAY GUNFiled May 15. 1949 Q a :Y? i x Q a 5 I Q -3! III!!! N & =2

' INVENTOR.

W/LL/AM M W/NDHOMJR Patented May 13, 1952 2,596,191 ROTATING NOZZLESPRAY GUN William M. Windham, Jr., Oxnard, Calif.

2 Glaims.

(Granted under the amended April 30',

This invention relates to portable, rotatingnozzle spray guns, and moreparticularly to spray guns in which the material being sprayed-is notatomized by use of air.

Heretofore, it has been customary inapplying preservatives to metalsurfaces, particularly ferrous metals, to use conventional spray gunswhich atomize the preservative by the use of air as the atomizingelement. It has been frequently observed that in applying suchpreservatives, the use of air as an atomizing agent at high relativehumidity promotes rust on the metal surfaces due to the depositingthereon of water droplets along with the preservative.

It is an object of this invention to provide a spray sun which willobviate the 'abovedisadvantages by creating a covering spray without theuse of atomizing air.

Another object of this invention is to provide a spray gun which insuresa complete coverage of surfaces to be coated, particularly internalsurfaces, such as cylinder walls.

A further object of this invention is to provide a rotating nozzle spraygun which issimple and inexpensive in construction and requireslittleskill in operating.

Other objects and many of the attendant ad-- vantages of this inventionwill be readily appreciated as the same becomes better understood byreference to the followingdescriptionl The apparatus of theinstantinvention comprises generally a portable rota'r y power unithaving a driving shaft. A preferred power unit is the type having apistol grip handle depending therefrom and an activating trigger forcontrolling the power unit. A housing is fixedly mounted to the powerunit circumjacent the driving shaft and is provided with a fluidchamher.

A fluid valve connected to the chamber by a conduit is rigidly mountedto the top of the power unit and is linked to a trigger pivotablymounted on the power unit handle for actuating the valve. A rotatabletube extends into the fluid chamber. where it is mounted on the drivingshaft, and is perforated to communicate with the chamber. The tubeterminates at its exterior end in a hemispherical perforated nozzle. Asleeve fixed to the housing circumjacent the tube serves to support thetube to prevent whipping during rotation.

In operation, fluid under pressure is supplied to the valve. When thevalve is actuated the fluid enters the chamber by means of the conduit,passes thru the perforations in the tube Application May'I3, 1949,Serial N 0. 93,175

act of March 3, 1883, as

wall and into the tube, from which it is ejected thru the perforationsin the nozzle.

and resulting in a fine rotating spray.

A preferred embodiment of the instant invention has been illustrated inthe accompanying drawings. wherein:

Fig. 1 is a partially sectioned View of the instant invention;

Fig. 2 is a view looking at the pistol grip end of Fig. 1;

Fig. 3'is an enlarged section of the perforated nozzle of the'instantinvention; and

Fig. 3a is an enlarged perspective view of a modification of the nozzle.

Referring to Figs. 1, 2, and 3 of the drawings, ll designates aportable, rotary power unit having a pistol grip l2 and an actuatingtrigger [3 on the grip for starting and stopping the power unit ii. Ahousing l4 having a fluid chamber H3 is fixedly mounted onto thethreaded front end H of the power unit H.

The conduit I8 connects the fluid chamber [6 with the outlet l9 of afluid valve 2!, which is rigidly mounted to the power unit II by meansof two brackets 22 clamped around the barrel of the power unit I l.Fluid is supplied under pressure into-the valve chamber 23 thru aconduit 24. A second'trigger 26; pivotably mounted to the power unithandle at 21', is linked to the valve needle 28 forcontrolling the valve2|.

A tube 29 extends into the fluid chamber l6 and is threaded onto the endof the driving shaft 3| of the power unit ll. Tube 29 is perforated at32 within the chamber It so that fluid under pressure may freely passfrom the chamber into the interior 33 of the tube 29. To the exteriorend 34 of the tube 29 is mounted a nozzle 36, having radial perforations31 extending in a line from the tip 38 of the nozzle 36, to a terminalperforation 39 at an angle of approximately from the nose of tip 38. Asupporting sleeve 4| is fixed to the housing 14 by means of the threadedportion 42 and serves to prevent whipping of the tube 29 duringrotation.

Operation The operation of this spray gun is as follows. Let us assumethat it is desired to coat the walls of an engine cylinder Withoutremoving the piston therefrom. The spark plug of the cylinder is removedand the nozzle 36 of the apparatus is inserted to a position just belowthe top wall of the cylinder. The trigger l3 and the trigger 26 arepressed simultaneously, actuating the power unit II and the fluid valve2| respectively. Fluid under pressure entering into the valve chamber 23thru the conduit 24 is permitted by the retraction of the valve needle28 to escape thru the outlet l9 into the chamber It by means of theconduit 18. Fromthe chamber IS the fluid enters the interior 33 of thetube 29 thru the perforations 32 and, traveling forward the length ofthe tube, is ejected thru the perforations 31 in the nozzle 36 mountedat the end 34 of the tube. The fluid leaves the nozzle in a fan shapedseries of jets starting from the tip 38 of the nozzle 36 and terminatingat the terminal perforation 39 which is directed away from the tip 38.

Since the nozzle 36 is ously with the ejection of the fluid, the fluidiminges equally on the whole circumference of the cylinder and also onthe top wall thereof. By progressively inserting the nozzle deeper intothe cylinder, the individual jets sweep successively walls therebyinsuring absolute coating of the whole cylinder interior. In practice,it has been found that only one or two turns of the nozzle are necessaryto completely coat the cylinder.

Fig. 3a. shows a modification of the nozzle 36 having, instead ofperforations, a slit 31 which is formed by first slitting the nozzle 36and then pressing the slit together forming the very thin jetted slit31', because the outside edges 43 of the slit 31' will be closertogether than the inside edges (not shown). The operation of this nozzleis virtually the same as the operation of the perforated nozzle. I

across the cylinder Obviously many modifications and variations of thepresent invention are possible in the light of the above teachings. Itis therefore to be understood that within the scope of the appendedclaims the invention may be practiced otherwise than as specificallydescribed.

- The invention described herein may be manufactured and used by or forthe Government of the United States of America for governmental purposeswithout the payment of any royalties thereon or therefor.

What is claimed is:

l. A portable spray gun comprising a portable rotary power unit having adriving shaft, said power unit having a pistol grip handle dependingtherefrom and an actuating trigger on said handle for controlling saidpower unit, a hous being rotated simultane pressure to said ing fixedlymounted to said power unit circumjacent said shaft, said housing havinga fluid chamber therein, a fluid valve rigidly mounted to said powerunit, a conduit connecting said fluid chamber to the outlet of saidfluid valve, actuating means linked to said valve and pivotally mountedto said power unit handle for actuating said fluid valve, a rotatabletube extending into the end of said fluid chamber, mounted on saiddriving shaft, and being perforated within said fluid chamber, said tubeextending outwardly substantially beyond said nousmg. a hemisphericalperforated nozzle mounted to the exterior end of said tube, a supportingsleeve fixed to the outer end of said housing circumjacent said tube andreceiving and supporting said tube to a point adjacent said nozzle, andmeans for supplying fluid under chamber thru said valve.

2. A portable spray gun comprising a portable rotary power unit, saidpower unit having a pistol grip handle depending therefrom, and anactuating trigger on said handle for controlling said power'unit, ahousing having a fluid chamber therein, a fluid valve rigidly mounted tosaid power unit, a conduit connecting said fluid chamber to the outletof said fluid valve, actuating means linked to said valve and pivotallymounted to said power unit handle for actuating said valve, a rotatabletube adapted to be driven by said driving unit, extending into saidfluid chamber and communicating therewith, said tube extending outwardlysubstantially beyond said housing, a nozzle mounted to the exterior endof said tube, a supporting sleeve fixed to the outer end of said housingcircumjacent said tube-and receiving and supporting said tube to a pointadjacent said nozzle, and means for supplying fluid under pressure tosaid chamber.

WILLIAM M! WINDHOM, JR.

REFERENCES CITED I The following references are of record in th file ofthis patent:

UNITED STATES PATENTS

